Dexamethasone suppression test is primarily used to assess suppression of which hormonal axis?

Enhance your readiness for the Physician Assistant Clinical Knowledge Rating and Assessment Tool (PACKRAT) 4 Exam. Utilize our flashcards and multiple-choice questions, complete with hints and explanations, to ace your upcoming test!

Multiple Choice

Dexamethasone suppression test is primarily used to assess suppression of which hormonal axis?

Explanation:
Dexamethasone works by providing negative feedback to the hypothalamic-pituitary-adrenal axis, so the test mainly assesses suppression of ACTH release from the pituitary. When dexamethasone is given, a normal or properly regulated axis reduces ACTH and, in turn, cortisol production by the adrenal glands. If ACTH is suppressed and cortisol falls, that indicates intact feedback control. If the axis cannot be suppressed, as in certain forms of Cushing syndrome, cortisol remains high. The renin system isn’t part of this axis, so it isn’t assessed by this test.

Dexamethasone works by providing negative feedback to the hypothalamic-pituitary-adrenal axis, so the test mainly assesses suppression of ACTH release from the pituitary. When dexamethasone is given, a normal or properly regulated axis reduces ACTH and, in turn, cortisol production by the adrenal glands. If ACTH is suppressed and cortisol falls, that indicates intact feedback control. If the axis cannot be suppressed, as in certain forms of Cushing syndrome, cortisol remains high. The renin system isn’t part of this axis, so it isn’t assessed by this test.

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